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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdc3aa3760e4afc30c50e148a2e9f13ac6641ea8129e0cca9be1f285a414368' 
  AND token = '5VP1FWNMZwlehtU1Ad44Gju6F/MAyHO4WNSfi7MN5DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}